It is typically 4 lines, if I am correct it can't be more or Less, and is always the A-B-C-D Deal. If you need a picture, I would suggest checking the link.
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A quadrilateral has 2 diagonals. It does not matter whether it is convex or not.
no
If any of the angles is greater than 180 degrees, the quadrilateral is concave.
Yes, such a quadrilateral could be shaped like an arrow head - (a large V capping a smaller v).
It may or may not be.